create a password for postgres user code example

Example 1: set username and password for postgresql database

sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'postgres';"

Example 2: how to connect postgres user password using command line

sudo -u postgres psql postgres

Example 3: create password for user in postgres

ALTER USER davide WITH PASSWORD 'hu8jmn3';

Example 4: create user and password postgres

dropuser username